Need more info for LoginAsync

   We are calling .LoginAsync and we have a simple login manager that simply creates a userbase with the credentials we pass in. It sets the name and isauthenticated=true. After the login is complete I expected that the EntityManager would then have a populated Principal but...well it does, but the name is null and isauthenticated is false. 

So, after login:
EntityManager.IsLoggedIn = true
EntityManager.Principal.Identity.Name = null
EntityManager.Principla.Identity.IsAuthenticated = false

using System;
using System.Security.Principal;
using IdeaBlade.EntityModel;
using System.Runtime.Serialization;
namespace SilverlightApplication2
{
#if !SILVERLIGHT
    public class SimpleLoginManager : IEntityLoginManager
    {
    #region IEntityLoginManager Members
        public IPrincipal Login(ILoginCredential credential, EntityManager entityManager)
        {
            return new UserBase(new GenericIdentity(credential.UserName), null);
        }
        public void Logout(IPrincipal principal, EntityManager entityManager)
        {
        }
        #endregion
    }
#endif
    [DataContract]
    public class GenericIdentity : IIdentity
    {
        #region IIdentity Members
        public GenericIdentity(string name)
        {
            Name = name;
            IsAuthenticated = true;
        }
        public string AuthenticationType
        {
            get;
            internal set;
        }
        public bool IsAuthenticated
        {
            get;
            internal set;
        }
        public string Name
        {
            get;
            internal set;
        }
        #endregion
    }
}

So, what am I doing wrong or how are my expectations wrong?
What I want to end up with is a correctly populated Identity on the EntityManager if possible.
(I know this example doesn't handle null, its just for testing upcoming changes)